Subject:
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Re: Help me convert this train program to use events (NQC)
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 28 Nov 2005 12:48:11 GMT
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Viewed:
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6126 times
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In lugnet.robotics, Jordan Bradford wrote:
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For Christmas I’m setting up a LEGO train on top of a narrow wall, so it has
to operate like a shuttle -- stop at each end and reverse motor direction. My
first attempt had a train regulator attached to a polarity switch, with the
switch being turned by a stepper motor I rigged up controlled by an RCX. When
the train reached a “station” it would hit a touch sensor and the RCX would
pulse the stepper motor, reversing the track polarity. This version works as
a prototype, but I don’t have enough cords to reach the touch sensors I would
have put at each “station” in the full layout.
So now I’m going to power the train motor directly from an RCX that rides
along as one of the cars. I’ll use light sensors on each end of the train to
look for white tiles placed between the track rails at each “station.”
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If the rcx is on the train why not mount touch sensors on the underside looking
down. You could then attach small ramps to the track which would trigger the
sensor. If you put the sensors on a spring loaded mounting you shouldn’t have
problems with the ramp potentially lifting the wagon as well as triggering the
sensor.
Steve
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